I live in New Orleans, which has an unusual concentration of strip clubs. I've heard people who work in them complain that to use a credit card, they require you to let them photograph your ID, make an impression or photo of your card, and have you sign a carbon copied form.
This gives some customers cold enough feet that they head out, but the reason is that people will run up a serious tab with lap dances, champagne and whatever else and then strenuously deny they ever set foot in such an establishment. I'm sure porn has the same problem.
It's pretty gross as far as I'm concerned. There's no legitimate moral distinction between falsely saying you never signed up for (random porn service) and Netflix, or saying you never got a lap dance and saying you never went to the ballet, and people acting differently causes legal businesses with avid customers real harm.